New document sidebar

This is the new redesigned sidebar UI for documents. The idea is that design doc functions will be first class citizens.

Screenshot:
![newsidebar](https://cloud.githubusercontent.com/assets/179458/3300201/37ceaa96-f61e-11e3-8375-276b17237660.png)

I don't quite follow what you mean here? Do you want to add `views.js` as a dependancy to `sidebarviews.js`? 
I'm finding that the documents view is growing very large. So I think we need to split it up more. I think we should look at having a couple view files that then get loaded into one `Views` object for use.